分布式电磁探测宽频数据采集系统设计与实现
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摘要
将地球物理勘探中广泛应用于地震数据采集的分布式采集技术引入电磁探测仪器,针对被测电磁场信号宽频带、大动态范围、强噪声干扰的特点,通过设计低噪声的模拟信号调理电路,采用24位Δ-Σ结构模数转换器(Analog-to-digital,ADC)和现场可编程门阵列(Fieldprogrammable gate array,FPGA)构建了高性能的数据采集系统。利用微控制器及其外围功能模块实现了数据采集系统的工作流程控制、数据存储和传输。主要技术指标测试和水槽模型及野外勘探对比试验结果表明:该系统性能先进,测量准确,能够满足分布式电磁探测数据采集的需求。
Distributed data acquisition technology,which is widely used in seismic exploration,was introduced in electromagnetic geophysical system.The measured electromagnetic signals possess the characteristics of broadband,large dynamic range and strong interference.Low-noise analog signal conditioning circuit was designed and a high-performance data acquisition system was constructed using 24-bit Δ-Σ Analog-to-Digital Converter(ADC) and Field Programmable Gate Array(FPGA).In this data acquisition system,a microcontroller with peripheral modules was used to achieve workflow control,data storage and transmission.The test results of main technical specifications,and flume model and field experiments show that the system is feasible and accurate,which meets the needs of data acquisition of distributed electromagnetic exploration.
Distributed data acquisition technology,which is widely used in seismic exploration,was introduced in electromagnetic geophysical system.The measured electromagnetic signals possess the characteristics of broadband,large dynamic range and strong interference.Low-noise analog signal conditioning circuit was designed and a high-performance data acquisition system was constructed using 24-bit Δ-Σ Analog-to-Digital Converter(ADC) and Field Programmable Gate Array(FPGA).In this data acquisition system,a microcontroller with peripheral modules was used to achieve workflow control,data storage and transmission.The test results of main technical specifications,and flume model and field experiments show that the system is feasible and accurate,which meets the needs of data acquisition of distributed electromagnetic exploration.
引文
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[2]赵国泽,陈小斌,汤吉.中国地球电磁法新进展和发展趋势[J].地球物理学进展,2007,22(4):1171-1180.Zhao Guo-ze,Chen Xiao-bin,Tang Ji.Advancedgeo-electromagnetic methods in China[J].Progressin Geophysics,2007,22(4):1171-1180.
[3]Kingman J E E,Donohue J G,Ritchie T J.Distrib-uted acquisition in electrical geophysical systems[DB/OL].[2011-06-19].http://www.dmec.ca/ex07-dvd/E07/pdfs/26.pdf.
[4]陆其鹄,吴天彪,林君.地球物理仪器学科发展研究报告[J].地球物理学进展,2009,24(2):750-758.Lu Qi-hu,Wu Tian-biao,Lin Jun.A research re-port on development of instrument science for geo-physics[J].Progress in Geophysics,2009,24(2):750-758.
[5]Garner S J,Thiel D V.Broadband(ULF-VLF)sur-face impedance measurements using MIMDAS[J].Exploration Geophysics,2000,31(2):173-178.
[6]White M,Gordon R.Deep imaging:new technologylowers cost of discovery[J].Canadian Mining Jour-nal,2003,4(3):27-28.
[7]Nimeck G,Koch R.A progressive geophysical ex-ploration strategy at the Shea Creek uranium deposit[J].The Leading Edge,2008,27(3):52-63.
[8]林品荣,郭鹏,石福升,等.大深度多功能电磁探测技术研究[J].地球学报,2010,31(2):149-154.Lin Pin-rong,Guo Peng,Shi Fu-sheng,et al.Astudy of the techniques for large-depth and multi-functional electromagnetic survey[J].Acta Geosci-entica Sinica,2010,31(2):149-154.
[9]张文秀,林君,徐汶东,等.分布式电磁探测接收系统中激电测量功能的实现[C]∥第九届中国国际地球电磁学术讨论会论文集.中国,桂林,2009:71-74.Zhang Wen-xiu,Lin Jun,Xu Wen-dong,et al.Imple-mentation of induced polarization measurement fordistributed electromagnetic detection system[C]∥Proceedings of the 9th China International Geo-Elec-tromagnetic Workshop,Guilin,China,2009:71-74.
[10]李金铭.地电场与电法勘探[M].北京:地质出版社,2005.
[11]王超,宋克柱,唐进.高性能水下地震数据采集系统设计与实现[J].吉林大学学报:工学版,2007,37(1):168-172.Wang Chao,Song Ke-zhu,Tang Jin.High per-formance data acquisition system for marine seismicsurvey[J].Journal of Jilin University(Engineeringand Technology Edition),2007,37(1):168-172.
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